i773> Nov. i 
j 774 , Jan. 22 
Feb. i8 
II 56 12 
6 o 261 
7 15 51 
6 39 51 
7 19 33 
[ 281 ] 
Emerfion of «, uncertain to fome feconds. 
Immerfion of the eye of b , 
Emerllon, 
ImmerTion of y, very certain. 
Emerfion, within two feconds. 
’ ^ both very certain. 
The following are my obfervations. 
1773, Nov. 
I 
12 
56 
47 
1774, Jan. 
22 
7 
2 
52 
8 
20 
44 
April 
14 
8 
28 
34 
9 
3 
20 
IS 
9 
32 
0 
16 
10 
21 
31 
May 
22 
13 
2 
20 
f Emerfion of « almoft certain; the Immerfion wa'9 
1. not oblerved on account of clouds. 
Immerfion, 
b J 
both certain. 
Emerfi-on, 
Immerfion of «, very certain. 
Emerfion of the fame. 
Immerfion of flamstead’s 115 in 8 • 
Immerfion of a ftar of the 6th magnitude in n 
Immerfion of m Virginis, very certain. 
I have lately difcovered two curious theorems, which 
I ihall here communicate to the Royal Society* 
theorem. 
Let A,B,c,D,E, F, be a polygon whofe 
/] fides are named c, d, e, /; and the 
exterior angles a, /3, 7, fo that the 
fide a be placed between the angles a 
and |6, b between /3, 7, &c. 
1 . ax^n7c^-\-b xfin + c X fin. (» + g + y) + ^ X fin. (« +j 3 + y + ^) 
+ ;x(fin.* + |3 + y+^'+0 +/xfin.(» + ^ + y + H' + ^)=(^. 
U/ 
Q q a 
